First, Mitsubishi uses FX5U series PLC with serial port and built-in modbus communication protocol, so that we can easily communicate with third-party equipment. If it is a communication between Mitsubishi PLC and the inverter, the focus is on designing the parameters. The inverter is biased, set the address, baud rate, check, etc., the inverter acquiesces to turn off the modbus protocol, and you need to select 1 in parameter 549, that is, the modbus protocol. The PLC is simply set up. In terms of programming, the FX5U uses ADPRW commands to read or write to slaves.
The Modbus network is an industrial communication system, which is composed of a programmable manipulator with an intelligent terminal and a computer connected by a common line or a local dedicated line. The architecture includes both hardware and software. It can be used for a variety of data acquisition and process monitoring. The Modbus protocol is a general-purpose language applied to electronic manipulators. Through this protocol, controllers can communicate with each other, and between controllers and other devices through a network (e.g. a large network). It has become a general industry specification. With it, control devices from different manufacturers can be connected to an industrial network for centralized monitoring. The protocol world says that a manipulator can recognize the audio structures used, regardless of the network they communicate through. It describes the process by which a controller pleads to access other devices, how it responds to requests from other devices, and how errors are detected and documented. It sets out the public landscape of the audio domain and the content.
Second, regarding the implementation of its communication, the Modbus port of the Modbus network transmission specification uses an RS-232-C compatible serial interface. The Modbus protocol sets the pattern for master device queries: device (or broadcast) address, function code, all data to be sent, an error detection domain. The response from the device is also made up of the Modbus protocol, which contains a domain that acknowledges the action to be taken, any data to be returned, and an error detection domain. If an error is generated during the audio acceptance process, or if the slave fails to fulfill its instructions, the slave will set up an error audio and send it out as a response to the Modbus protocol that it simply acts as the master and expects the slave to get a response. Similarly, when the controller receives an audio, it will establish a pattern of responses from the device and return to the sending controller
Therefore, the advantage of using Mitsubishi PLC for modus communication is to save wiring and reduce costs.
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